diff --git a/src/w32term.h b/src/w32term.h
index 580ae08f772..10518774522 100644
--- a/src/w32term.h
+++ b/src/w32term.h
@@ -738,6 +738,11 @@ EXFUN (Fx_display_grayscale_p, 1);
       ? BDF_1D_FONT : BDF_2D_FONT))
 
 typedef DWORD (WINAPI * ClipboardSequence_Proc) ();
+typedef BOOL (WINAPI * AppendMenuW_Proc) (
+    IN HMENU,
+    IN UINT,
+    IN UINT_PTR,
+    IN LPCWSTR);
 
 /* arch-tag: f201d05a-1240-4fc5-8ea4-ca24d4ee5671
    (do not change this comment) */